MIT (Sloan) follows Stanford by accepting GRE or GMAT scores
MIT just posted this today:
Test Scores requirements: GMAT or GRE The GMAT or GRE is required of all applicants and must be taken before submitting your application. Once your online application is submitted, we will allow replacement of your test scores. The MIT Sloan MBA Program school codes are the following; for the GMAT school code is X5X-QS-41; for the GRE the school code is 3791. Test scores are only valid for five years; therefore only tests taken after January 1, 2002 will be considered.
Yesterday, this same section read: GMAT The GMAT is required of all applicants and must be taken before submitting your application. If you have taken the GMAT more than once, you should self-report your highest scores only. Once your online application is submitted, we will not allow replacement of your GMAT score. The GMAT school code for the MIT Sloan MBA program is X5X-QS-41.
If you're applying to MIT, you should probably check this out if you want to use GRE scores instead of GMAT.